As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT NR 2641 THE CREW REPORTED A STRONG BURNING SMELL EVERYTIME THRUST WAS REDUCED TO IDLE IN FLIGHT. THE SMELL WENT AWAY WHEN THRUST WAS INCREASED. MX INSPECTED AND PERFORMED ENGINE GROUND RUNS AT VARIOUS POWER SETTINGS AND PACK SETTINGS AND COULD NOT DUPLICATE BURNING SMELL. OPS CHECKS WERE GOOD.